Optimize tencent_vector knowledge base deletion error handling with batch processing support

[issac2e]

Summary

This PR fixes the batch size limitation error in Tencent Vector Database deletion operations by implementing batch processing logic similar to the existing add_texts method.

Issue Fixed: Resolves #22725 - ServerInternalError when deleting large numbers of vector indexes (#22725)

Context: During knowledge base document retry operations, the system attempts to delete old indexes in bulk. However, when the number of indexes exceeds the API's batch size limit (1000), it causes a server error.

Dependencies: No additional dependencies required for this change.

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

LGTM